3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $s="a(bcdefghijkl(mno)p)q"; $return = preg_replace_callback( '|(\((.+)\))+|', function ($matches) { return $matches[2]; }, $s ); print_r($return);
based on UMCor
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
abcdefghijkl(mno)pq